Centimeter Band Observations of Circular Polarization in Flaring Blazars from the Effelsberg and Michigan Programs

Details Centimeter Band Observations of Circular Polarization in Flaring Blazars from the Effelsberg and Michigan Programs Centimeter Band Observations of Circular Polarization in Flaring Blazars from the Effelsberg and Michigan Programs

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543422a&link_type=abstract

American Astronomical Society, AAS Meeting #215, #434.22; Bulletin of the American Astronomical Society, Vol. 42, p.378

Astronomy and Astrophysics

Astrophysics

Scientific paper

A program to study the centimeter-band spectral variability in Stokes V with the Michigan 26-meter radio telescope (Astrophys. Sp. Sc., 288, 17, 2003) has provided evidence for polarity changes and wavelength-dependent variability; this work has been restricted to time-averaged data for a small subset of strong sources because of the low levels of circularly polarized emission. A new calibration technique has recently been developed which yields high-accuracy full-Stokes data from measurements obtained with the Effelsberg 100-m radio telescope (Astron. Astrophys., 498, 591, 2009). This capability is important since it permits study of Stokes V emission from a wide range of sources and a search for variations on rapid time scales. As a test of the achieved accuracy, we have compared coeval 5 GHz measurements obtained in 2007 from the two radio telescopes. We present multi-epoch data for three program sources -- 3C84, 3C279, and 2145+067 -- which illustrate that excellent agreement in polarity and amplitude is attained.
UMRAO is supported in part by NSF grant AST-0607523 and by funds from the University of Michigan. E. C. is supported by a grant from the EU Framework 6 Marie Curie Early Training Programme under contract MEST-CT-2005-19669``ESTRELA''.

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